Titanocene-Functionalized Polymeric Dendrimer

Significance

Titanocene-functionalized polymeric dendrimer 8 was prepared via polymerization of styrene with the first-generation dendrimer 7 bearing titanocene and styrene groups as a cross-linking monomer (Ti loading = 0.11 mmol/g; cross­linking = 0.64%). The polymeric titanocene 8 catalyzed the reaction of PhMe₂SiCl and CH₂=CHMgBr to give 1,4-silylated 2-butene (PhMe₂SiCH₂CH=CHCH₂SiMe₂Ph) with TON = 158. The polymeric titanocene 9, in which the titanocene group was more directly anchored onto the PS matrix, showed much lower activity (TON = 39) in a similar catalytic reaction.